With political uncertainty over the future of the UK's financial passport and trading relationships with other EU countries, the UK's vote to leave the European Union is a chance for mainland European cities to attract business that would usually go to London.

"It's an opportunity to improve, an opportunity for all, that affects and benefits the society as a whole. Therefore, we must act together and united. In a global world, it is useless to go it alone," Cifuentes said.

In a presentation, Madrid focuses on how relatively inexpensive it is compared to other places.

Here's the chart showing how Madrid is cheaper than 104 other cities for expats:

Madrid

The presentation also highlights how few (58) days of rain the city has in relation to others, as well as its high average temperature:

Madrid

And here's the video presentation:

Madrid's local government isn't the only one to be bullish on the city.

Abouhossein took a look at office rents and capacity in different EU cities, with Madrid coming out on top both for cost and supply.

Here's Abouhossein (emphasis ours):

"In terms of markets with high availability and high oncoming supply, Madrid places first, followed by Frankfurt and Paris."

"In terms of prime rental levels, Madrid is the cheapest (€27/sqm/month) although brokers note there is a lack of Grade A office space, followed by Frankfurt (€40/sqm/month) and Paris (€67/sqm/month)."

Here's how the cost compares with other cities vying for London's financial crown:

JP Morgan

And the Spanish capital also tops the list for percentage of vacant offices:

JP Morgan

With the promise of sun, cheap rent and good football, there will be many in London who might start to see Brexit's upside.